Dose and number of applications that maximise fungicide effective life exemplified by Zymoseptoria tritici on wheat - a model analysis

A - Papers appearing in refereed journals

Van Den Berg, F., Paveley, N. D. and Van Den Bosch, F. 2016. Dose and number of applications that maximise fungicide effective life exemplified by Zymoseptoria tritici on wheat - a model analysis. Plant Pathology. 65 (8), pp. 1380-1389. https://doi.org/10.1111/ppa.12558

AuthorsVan Den Berg, F., Paveley, N. D. and Van Den Bosch, F.
Abstract

Two key decisions that need to be taken about a fungicide treatment programme are (i) the number of applications that should be used per crop growing season, and (ii) the dosage that should be used in each application. There are two opposing considerations, with control efficacy improved by a higher number of applications and higher dose, and resistance management improved by a lower number of applications and lower dose. Resistance management aims to prolong the effective life of the fungicide, defined as the time between its introduction onto the market for use on the target pathogen, and the moment when effective control is lost due to a build-up of fungicide resistance. Thus, the question is whether there are optimal combinations of dose rate and number of applications that both provide effective control and lead to a longer effective life. In this paper, it is shown how a range of spray programmes can be compared and optimal programmes selected. This is explored with Zymoseptoria tritici on wheat and a quinone outside inhibitor (QoI) fungicide. For this pathogen-fungicide combination, a single treatment provided effective control under the simulated disease pressure, but only if the application timing was optimal and the dose was close to the maximum permitted. Programmes with three applications were generally not optimal as they exerted too much selection for resistance. Two-application fungicide programmes balanced effective control with reasonable flexibility of dose and application timing, and low resistance selection, leading to long effective lives of the fungicide.

Keywordseffective life; fungicide resistance; healthy area duration; leaf blotch; selection ratio
Year of Publication2016
JournalPlant Pathology
Journal citation65 (8), pp. 1380-1389
Digital Object Identifier (DOI)https://doi.org/10.1111/ppa.12558
PubMed ID27708459
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Chemicals Regulation Directorate (CRD) of the Health and Safety Directorate
Department of Environment, Food and Rural Affairs
Funder project or codeSustainability
Quantifying Sustainable Systems
Publisher's version
Copyright license
CC BY
Output statusPublished
Publication dates
Online04 Sep 2016
Publication process dates
Accepted23 May 2016
PublisherWiley
ISSN0032-0862

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